Firearm top rail



FIG. 1 is a perspective view of a firearm top rail showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a rear side elevation view thereof; and,

FIG. 7 is a front side elevation view thereof.

The broken line in the drawings depicts unclaimed portion of the top rail only and forms no part of the claimed design. 

CLAIM The ornamental design for a firearm top rail, as shown and described. 